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Claude Opus 5.5
Claude Opus 5.5 takes on hours-long coding, research and agent tasks, delivering top-tier results for a fraction of what Opus 5 charges.
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What Makes Claude Opus 5.5 the Pick for Multi-Step Projects
Compared with Opus 5, it burns fewer tokens, communicates with greater clarity, and wraps up sprawling agentic work sooner.
- Spend About 40% Less on Everyday JobsBecause Claude Opus 5.5 sips less compute, standard settings price out at $4 per million input tokens, $20 output, and $0.20 for cache reads.
- Replies That Land Over 30% QuickerToken generation outpaces Opus 5 by more than 30%, and switching on Fast mode inside Claude Code can push throughput to 2.5x.
- Writing That Reads Like a Person Wrote ItAnswers open with the bottom line, prose stays easy to follow, and Claude Opus 5.5 holds up well across long working sessions.
Getting Claude Opus 5.5 Running in Three Steps
Follow three simple steps to point Claude Opus 5.5 at coding, research, or jobs that run unattended.
What Claude Opus 5.5 Brings to the Table
The strengths that set Claude Opus 5.5 apart: agentic coding, large-scale migrations, injection defenses, research accuracy, and leaner token use.
Top-Tier Agentic Coding Without the Premium
Claude Opus 5.5 posts 54.6% on FrontierCode and 52.5% on CursorBench while keeping spend per task well under competing models.
Migrations and Audits Across Whole Repositories
One tester moved 680,000 lines in less than a day; another repaired 200,000 lines in three hours — a job that took Opus 5 twenty.
Hardened Against Prompt Injection
Across coding, tool use, and browsing, Claude Opus 5.5 equals or surpasses Opus 5 on injection resistance and drew level with Fable 5.1 on Gray Swan's benchmark.
Reliable Research and Knowledge Output
Sixteen of eighteen reports produced by Claude Opus 5.5 met our quality threshold, and the model earned 1846 Elo on GDPval-AA v2.1.
Built for Finance and Business Analysis
Walleye Capital watched Claude Opus 5.5 clear their test suite on the lowest effort setting, and its merger model finished ahead of Opus 5 in 63 minutes.
Leaner Token Consumption
Cheaper tokens plus fewer of them per job add up to roughly 40% savings, and testers reported wrapping up in half as many turns.
Claude Opus 5.5: Frequently Asked Questions
Straight answers on Claude Opus 5.5 pricing, response speed, autonomous safety, and how to get access.
What does Claude Opus 5.5 cost to run?
Input tokens run $4 per million and output $20 — a fifth below Opus 5 — while cache reads cost $0.20. Most everyday workloads land around 40% cheaper.
How quickly does Claude Opus 5.5 respond?
Output streams more than 30% faster than Opus 5, and turning on Fast mode within Claude Code can lift that to 2.5x.
Can I let Claude Opus 5.5 run on its own?
It came first in our automated behavioral audit and rarely takes irreversible actions or wanders past the boundaries it was given.
How does Claude Opus 5.5 stack up against Opus 5 and Fable 5.1?
On most tasks it keeps pace with Claude Fable 5.1 and clearly outpaces Opus 5, though the practical gap is smaller than raw benchmark numbers imply.
Does Claude Opus 5.5 support biology and cybersecurity work?
Approved laboratories can apply to the Life Sciences Verification Program today, and Cyber Verification Program access opens up over the next few weeks.
Will my subscription usage limits change?
They do — five-hour caps increase across Pro, Max, Team, and seat-based Enterprise plans, and you get a rate limit reset that can be banked and used whenever you like.
Give Claude Opus 5.5 Your Hardest Job
Get going with Claude Opus 5.5 for around 40% lower spend, along with higher five-hour limits and a rate limit reset subscribers can save for later.